Relationships between assemblage similarity and distance show stronger strength of dispersal role on structuring aquatic shredder insect assemblages compared to aquatic non-shredder insect assemblages. Dots are assemblage similarity and distance between pairs of 16 reaches in an elevational gradient from 156 to 2720 m asl in northern Central America. Black solid lines are the mean fit Bayesian linear model between variables with a Zero-inflated Beta distribution. Blue faded lines are a 1000 possible lines from the Bayesian posterior distribution of the fitted model. Third column shows density plots of estimated values for slopes, dashed red line indicates the zero value.